Commit Graph

524 Commits

Author SHA1 Message Date
Philip Eisenlohr da53656c9a added C3D20R (type 9) to list of possible non-local elements (Christoph, should we invent a reasonable error number for this? "-1" may not be optimal...) 2010-08-19 23:00:26 +00:00
Philip Eisenlohr c352146fe6 exchanged forall (warning causers) to nested do loops
deleted (currently unused) symmetrization of H tensor in CPFEM.f90 --> Denny pls advise?
2010-08-19 21:35:38 +00:00
Franz Roters f78b07448f some modifications in line with Davids analytical model
input some additional variables via material.config
2010-08-17 14:23:55 +00:00
Philip Eisenlohr bb9899e7de 1) added element type 57 (C3D20R) reduced quadratic hexahedral
2) need discussion about the present omission of the FE_nodesAtIP for type 8 --> added comment into source code
2010-08-16 22:53:24 +00:00
Alankar Alankar 9f071c3e01 Added kink-pair pre-factor for screw dislocation mobilities on non-basal slip systems in hex 2010-08-06 15:53:45 +00:00
Philip Eisenlohr 298cecbfec corrected syntax errors (long lines, line continuation by \) and logical mistake in mpie_cpfem_marc / abq_std which went unnoticed in ifort. Using SunStudio f90 surfaced those... 2010-08-03 23:47:00 +00:00
Alankar Alankar 60decea760 Calibration (Prismatic slip) of the new dislocation density based CPFE model for single crystal alpha-Ti (Titanmod). Formulated edge and screw dislocations mobilities in presence of kink pairs. Updated comments. The model shows the plateau in stress evolution in prismatic orientation which is observed in experiments. 2010-07-15 07:16:15 +00:00
Martin Diehl 49926d5d66 F77 --> F90 polishing/condensation as far as possible.
next step is change of Re/Im FFT to Re only...
2010-07-13 15:29:26 +00:00
Philip Eisenlohr 4d110126da adopted improvements done by Arun Prakash.
mesh:
elemType identification based on lower case
Abaqus now reports more errors

IO:
new function to inquire whether inputfile contains "parts"
new function to assemble multiply included inputfile into a flat one
awareness of range generation in element numbers
error reporting
2010-07-13 10:26:07 +00:00
Alankar Alankar eb7830dc8f New Titanium CPFE model based on dislocation density. Running but calibration and changes needed. 2010-07-13 08:19:25 +00:00
Martin Diehl 397db06fb3 cpfe_general now returns also Kirchhoff-stress P and dPdF
added dummy variables P and dPdF to mpie_cpfe_* to be able to call cpfem_general correctly
2010-07-07 09:58:18 +00:00
Martin Diehl 80016f8429 added P and dPdF for the call to cpfem_general, made some comments in the code, aligned some loops 2010-07-07 09:10:54 +00:00
Martin Diehl f9834bc612 changed types of integers and reals in fourier transform, changed some variables and cleaned up code to make it easier to understand 2010-07-05 16:01:36 +00:00
Ricardo Lebensohn c3e222dbbd errs added etc. 2010-07-05 11:33:48 +00:00
Philip Eisenlohr 4f76eada31 started suggestions for F77 --> F90 style
xkdyad useful..?

looking for error calculation (Ricardo to rescue here)
2010-07-02 17:15:53 +00:00
Martin Diehl d6ba9d54b6 changed declaration of two variables from real to int, spectral method is now working.
started to commend Ricardos code, layoutet loops and removed some redundant variables.
until now, no error calculation is done. at the moment calculations are in an infinite loop
2010-07-02 14:10:36 +00:00
Martin Diehl 661bb97800 corrected some problems in building mesh 2010-07-01 15:20:39 +00:00
Martin Diehl 2ec39c936c added first version of spectral method, changed corrected functions to get correct path to files 2010-07-01 15:20:06 +00:00
Martin Diehl c3e51e5330 added functions to read out resolution, dimension and homogenization from mesh file 2010-06-25 11:31:05 +00:00
Christoph Kords eb0cc24a8e no need for material parameter "a" anymore, dislocation stress calculation now works without "core spreading" 2010-06-21 16:01:05 +00:00
Christoph Kords 7d6e52067b dislocation stress based on dislocation density gradients 2010-06-21 15:58:56 +00:00
Christoph Kords 6d874e2c1f nonlocal stiffness calculation:
rather perturb all components at once (and optionally decrease the frequency of the Jacobian update with the iJaco parameter) than perturbing only a single component per cycle
2010-06-17 06:32:56 +00:00
Philip Eisenlohr 1c72439350 first shot at init with CPFEM_general
better would be to manually read the mesh resolution, set up Spectral solution strategy and call CPFEM_general just during BVP solution.
2010-06-10 15:32:06 +00:00
Philip Eisenlohr 8ea52ac495 mpie_spectral now can read loadcase data
adapted error codes
2010-06-10 14:51:10 +00:00
Martin Diehl 386ca7ebc3 added some basic I/O functions to mpie_spectral.f90 2010-06-10 08:50:04 +00:00
Christoph Kords 740db98090 - use upwind differences scheme for fluxes instead of central differences
- introduced possibility to "reflect" fluxes at free surfaces in order to have quasi-periodic fluxes
2010-06-09 08:56:00 +00:00
Philip Eisenlohr 11b98fbfa6 added ID functionality and correct line endings 2010-06-08 10:10:57 +00:00
Philip Eisenlohr 82687d31c8 first shot at mpie_spectral wrapper 2010-06-08 10:08:15 +00:00
Philip Eisenlohr 7e78932976 renamed "mpie_cpfem_init" subroutine within mpie_interface module to more general name "mpie_interface_init" 2010-06-08 09:35:13 +00:00
Christoph Kords 71c6179ee5 dislocation stress had wrong sign in some components 2010-06-08 09:34:23 +00:00
Christoph Kords 3ce1882d29 when calculating dislocation stress at grain boundaries, densities are now extrapolated similarly to like it was already done at free surfaces 2010-06-07 16:01:37 +00:00
Christoph Kords 3989cc2688 dislocation stress now considers dislocation segments of length V^(1/3) and ensures non-singular solution for points that are collinear to the dislocation line by means of a core spreading parameter "a". stress is scaled by a reference cutoff radius "r" to avoid mesh-dependent stress values.
corrected formula for conversion of anisotropic elastic constants to isotropic Youngs modulus and poissons ratio
2010-06-07 14:32:23 +00:00
Franz Roters 5283ba5546 if it is pReal it should be 1.0 not just 1 2010-05-31 07:12:45 +00:00
Christoph Kords 76b392e12f dislocation stress calculation in constitutive_nonlocal_microstructure: corrected mapping from lattice to slip system frame and the neighboring dislocation density formulation 2010-05-28 13:12:36 +00:00
Franz Roters bb73a74325 there was a line break missing so that it did not compile 2010-05-26 17:10:26 +00:00
Denny Tjahjanto 9932c90c73 restoring the crystallite.f90, IO.f90 and material.f90 to the version 575. the version 576 of these files contain some uncleared debugging statements. 2010-05-26 16:34:44 +00:00
Denny Tjahjanto d114a600c3 fixed some errors in QuaternionToEuler, RToQuaternion to get the correct texture representation in the output. 2010-05-26 15:52:54 +00:00
Christoph Kords e5f0af638e fixed calculation of dislocation stress for elements with a single ip and no neighbors; used to get segmentation fault 2010-05-26 09:17:10 +00:00
Christoph Kords 0c5bc83469 in nonlocal_microstructure: at the model surface the excess density is now extrapolated from opposite neighbor instead of assuming zero density; this results in better modeling of the dislocation stress at the surface
restructured nonlocal_dotstate, to be able to easily switch on and off particular effects in the microstructure evolution
nonlocal_dotstate now enforces a cutback when single density runs the risk of becoming negative; in the case of a state already below the relevantState dotState is set to zero
introduced two new output variables: rho_dot_edge and rho_dot_screw
2010-05-21 08:51:15 +00:00
Christoph Kords dba4ae7ef1 new numerics parameter "defgradTolerance" replaces "relevantStrain" in cpfem, since "relevantStrain" is also used in crystallite but in a different context.
"defgradTolerance" gets the same standard value as "relevantStrain" so calculations should be consistent with older ones
2010-05-20 14:55:11 +00:00
Christoph Kords 3a23dc4bbd first call to hypela2 in inc 0 is done with computation mode 2 (=plain calc), but since rev. 539 the second call was done with computation mode 6 (=only return values) instead of 2. This doesnt work, because computation mode 2 might calculate stress and tangent for all materialpoints, but the mapping from lattice to current configuration is only done for the element/IP that triggers the call.
So switched back to the former order of calls which also works for marc2010:

el 1 IP 1		|	el 1 IP 2
			|
inc mode lovl	|	inc mode lovl
------------------	|	------------------
0       2       6	|	0	2	6
1       6	4	|	1	6	4
1	4	6	|	1	3	6
1	6	4	|	1	6	4
1	1	6	|	1	2	6

Still to be checked:
according to Franz the lovl order could be different in contact analysis (e.g. starting with lovl 4 instead of 6)
2010-05-20 09:14:59 +00:00
Christoph Kords 51da3b6242 sorry, in rev 568 some variables were not declared in crystallite_postResults 2010-05-18 12:36:09 +00:00
Christoph Kords 472684c30e make element type 8 (= hex8 reduced integration) available for nonlocal constitutive law 2010-05-18 08:13:23 +00:00
Christoph Kords 19b6fae88b added a missing exclamation mark in front of an $OMP directive 2010-05-18 08:07:55 +00:00
Christoph Kords d96780967b added some output variables in crystallite: F, Fe, Fp, Ee, P, S 2010-05-18 07:57:13 +00:00
Claudio Zambaldi 15328e51cf Like this Euler angles AND grain rotation should be OK. 2010-05-11 15:06:21 +00:00
Franz Roters 483584ceb3 improved version of general I/O functions
renamed module cpfem_interface to mpie_interface
2010-05-11 06:57:15 +00:00
Franz Roters e810e5cfa1 changed fileopen routines in IO.f90 to use solver dependant functions defined in the interface routines
DID NOT test ABAQUS versions yet, not shure whether (V)GETOUTDIR returns path with or without terminating slash
2010-05-10 15:02:59 +00:00
Philip Eisenlohr 0416c9a616 reworked build_ipNeighborhood
added C3D8R reduced integration hexahedral element
2010-05-10 14:54:59 +00:00
Claudio Zambaldi 2405a51042 crystallite:
- grainrotation calculation now is done with symmetryID 0, i.e. without symmetry reduction since we want the absolute misorientation.
- While math has everything in radians, post results eulerangles and axisangle are given in degrees.
And: grain rotation seems OK after the previous changes in math module.
2010-05-07 12:01:46 +00:00
Philip Eisenlohr 97f206d0bc new errors regarding Spectral method input file parsing
mesh setup from Spectral input file
$Id$ in FEsolving activated
2010-05-06 16:40:47 +00:00
Philip Eisenlohr e4067f2d26 debugged zoo of rotation operations and transformations
all angles now in radians

introduced a rudimentary check in math_init to complain (IO_error) about broken transformations (e.g. quat --> R --> quat)
2010-05-06 14:07:21 +00:00
Franz Roters f23b4d16d1 updated section with dislotwin paramters 2010-05-06 09:01:54 +00:00
Franz Roters 383a36b226 added comment on reformating to common block files
added modifications necessary for running the subroutine with Marc/Mentat2010
2010-05-06 08:50:54 +00:00
Alankar Alankar 393a67e587 now stating instance when sanity checks run into trouble 2010-05-05 13:36:59 +00:00
Christoph Kords 0a36527f61 fixed bugs in math_quaternionDisorientation
though running, there still seem to be some problems with the quaternion functions, since crystallite_grainRotation gives some dubious results!
2010-05-04 16:02:05 +00:00
Philip Eisenlohr ba48e5d3ab fixed syntax errors in last commit -- hopefully no further ones... 2010-05-04 13:03:35 +00:00
Philip Eisenlohr cecffffe2b disorientation with symmetryType == 0 returns plain misorientation
complain about unknown symmetryType
2010-05-04 12:54:13 +00:00
Claudio Zambaldi adaeb0e1ef rotation axis is undefined for small angles and therefore gets a NaN 2010-05-03 18:27:19 +00:00
Christoph Kords ea718573ef return 180° disorientation about 100 for neighbors with different phases 2010-04-29 12:28:51 +00:00
Christoph Kords 8ab101da50 safe use of acos function in math_QuaternionToAxisAngle 2010-04-29 10:33:39 +00:00
Philip Eisenlohr 15e5dcf8f2 math_QuaternionToAxisAngle now safe for small or close to 2pi rotations. 2010-04-29 10:01:09 +00:00
Franz Roters e8719cb6b8 Table driven input works wirh 2010!
That leaves DDM to do for tomorrow ;-)
2010-04-29 09:43:31 +00:00
Franz Roters aaf1bf0edf fixed (first) problem with Marc2010 single job with old style input and extended precision should work now! 2010-04-29 08:15:29 +00:00
Christoph Kords c34c07a6ff statedamper has to be local (specific for each e,i,g); with a global damping we may produce spurious convergence 2010-04-29 07:41:29 +00:00
Christoph Kords 77dc16d15f print aged state of 1 1 1, which always exists, to avoid segmentation fault 2010-04-29 07:34:20 +00:00
Claudio Zambaldi 79f286f24c small typo 2010-04-28 17:45:30 +00:00
Claudio Zambaldi 0b83fa0fb2 corrected (?) disorientation calc and introduced some new assisting functions 2010-04-28 17:19:58 +00:00
Claudio Zambaldi 35cebfb132 extended output string length for init msg 2010-04-28 17:19:06 +00:00
Franz Roters a36951a6ac changed common block files to release version 2010-04-28 07:28:12 +00:00
Claudio Zambaldi e8ab495a6c Introduced new parameter NaN, not a number. It should be assigned for invalid results, such as currently for misorientation of unknown crystal symmetry. 2010-04-19 13:40:22 +00:00
Claudio Zambaldi cab2261693 New array crystallite_symmetryID(i,g,e) is now filled during initialization run with 1 for bcc and fcc phase and 2 for hexagonal phase. The values are needed for misorientation calculations to apply the correct symmetry operators for cubic and hexagonal phases. 2010-04-19 10:03:34 +00:00
Claudio Zambaldi 249042c2d3 New output can be requested from crystallite:
(output) grainrotation
it gives the deviation from the initial grain orientation 
in axis-angle representation with the angle in degrees.
2010-04-12 11:14:36 +00:00
Claudio Zambaldi 653837046e new: math_QuaternionToAxisAngle 2010-04-12 11:07:25 +00:00
Christoph Kords adf6206b71 corrected symmetry operations for hex. 2010-04-12 08:04:26 +00:00
Claudio Zambaldi fc3f35cf3b debugger = .false. 2010-04-08 09:30:25 +00:00
Christoph Kords 1730a90e12 corrected ip numbers in FE_ipNeighbor for element type 21; used to get wrong neighborhood for this element type 2010-04-06 11:45:23 +00:00
Philip Eisenlohr 9b5047c828 corrected two OMP CRITICAL terminations 2010-04-06 06:47:15 +00:00
Christoph Kords 1bf740eb9d an allocation statement was deleted from rev 518 to rev 520!!! 2010-03-30 13:15:18 +00:00
Christoph Kords 67c523e4b1 enclosed output statements in an "if (verboseDebugger)" 2010-03-25 08:27:42 +00:00
Denny Tjahjanto 9026cc4016 again corrections. but this version must work. 2010-03-24 16:23:21 +00:00
Denny Tjahjanto 414050303b forgotten: the change in the input config 2010-03-24 13:28:46 +00:00
Denny Tjahjanto 40b1478dac the latest RGC model + corrections for "element homogeneous" feature 2010-03-24 13:20:12 +00:00
Franz Roters 3aa2dd5fef removed special characters from twip steel section in material.config
changed crirtical twin stress in constitutive_dislotwin.f90
2010-03-24 08:17:27 +00:00
Christoph Kords 2c6c8fa04e ensure positive eulerangles in math_QuaternionToEuler 2010-03-19 16:11:53 +00:00
Christoph Kords f4e5d32cde added flag verboseDebugger to debug in order to have more control about debugging statements
set this to true if you want extended debugging info in the output file
2010-03-19 14:14:08 +00:00
Claudio Zambaldi 418bb9ecbe small improvement in readability 2010-03-19 12:56:00 +00:00
Christoph Kords 948c119ee9 changed internal representation of orientation and misorientation from euler angles to quaternions (this should also fix some bugs in the math_misorientation subroutine). includes a couple of new functions in math.f90 and some changes in crystallite.f90.
beware that crystallite output "orientation" now by default returns the orientation as quaternion. if you want euler angles instead, you have to add "eulerangles"  as a crystallite output in your material.config file (see material.config template).

for input of orientations in the texture block of the material.config you still have to specify the rotation in terms of euler angles, quaternions are not yet supported for input.
2010-03-18 12:23:17 +00:00
Christoph Kords e6fdfdfc36 iJacoStiffness belongs to numerics, not debug
sorry for not having checked that before
2010-03-17 17:00:54 +00:00
Christoph Kords 1a992e1aef nonlocal stiffness calculation produced segmentation fault for cycle number > 16. Corrected calculation of perturbation indices k and l. 2010-03-10 09:53:41 +00:00
Christoph Kords e3dd7551dc added output for dislocation evolution rate associated with flux: "rho_dot_flux" 2010-03-10 09:49:40 +00:00
Philip Eisenlohr 4752bbe42e deleted unused <global> part from file 2010-03-09 15:36:07 +00:00
Christoph Kords 61bd0224c1 - corrected an if statement in the state loop
- nonlocal stiffness calculation: we perturb all material points at the same time, so instead of N^2 loops we just need N
- set "forceLocalStiffnessCalculation" to false as standard
2010-03-04 17:27:39 +00:00
Christoph Kords a0d28ebc18 - flux calculation is now also compatible to neighborhood of local constitution
- flux density interpolation now depends on the position of the interface between ttwo neighboring material points
- simplified flux calculation scheme
- introduced sanity check for dislocation velocity to ensure v*dt< cellsize
2010-03-04 17:14:47 +00:00
Christoph Kords 947af80a2e removed old debugging statements 2010-02-26 12:02:49 +00:00
Philip Eisenlohr 8c8ed34356 reworked crystallite part to allow for flexible user output
--> new "crystallite" part in config file
--> new "crystallite" option for microstructures
--> new output file "...job.outputCrystallite" to be used in conjunction with marc_addUserOutput for meaningful naming of User Defined Vars.
2010-02-25 17:39:11 +00:00
Christoph Kords 538faecf45 new output "dislocationvelocity" 2010-02-23 17:23:07 +00:00
Christoph Kords c1717329ac only need 2 logicals in crystallite_stressAndItsTangent to reflect all possible integration states, so crystallite_onTrack was obsolete and replaced by crystallite_todo; broken state update now directly produces a cutback 2010-02-23 09:46:39 +00:00
Claudio Zambaldi 7526a24a1b now with functionality to output a "JOB.outputHomogenization". This contains size descriptions of all requested output variables to be parsed by a further script to generate meaningful names for user defined vars... (watch out!) 2010-02-19 18:03:16 +00:00
Christoph Kords aab5598d96 detabbed file for better readability 2010-02-19 13:44:38 +00:00
Philip Eisenlohr 8c5852dedf corrected messed up output of grain orientation in t16-file.
this bug affected at least all calculations done after revision 480 (Dec 18, 2009)
2010-02-18 16:09:45 +00:00
Denny Tjahjanto e9aac0c4af (1) change phaseOfGrain from real to integer and (2) introducing a condition to switch off the grain reshuffling when element homogeneous is requested. 2010-02-18 15:54:10 +00:00
Claudio Zambaldi d60d8a4103 small readability improvement 2010-02-18 15:06:08 +00:00
Franz Roters 7e632e8132 corrcected definition of forceLocalStiffnessCalculation 2010-02-18 14:43:40 +00:00
Philip Eisenlohr e1a25e0f73 renaming of abaqus to _std and adding of VUMAT interface for explicit. 2010-02-18 10:23:42 +00:00
Philip Eisenlohr af06e8e58f fixed some dangerous constructs in computation mode assignments
introduction of separate stress and stiffness variables to pass on to CPFEM_general (of dimension 6)
2010-02-18 10:23:02 +00:00
Philip Eisenlohr 78808a7d47 corrected corrupted header $id 2010-02-18 10:18:15 +00:00
Philip Eisenlohr 4cb7254a21 added new computation modes 8 and 9 for Abaqus_exp. These correspond to mode 1 and 2 but do collection and calculation in one step.
stress and stiffness are always of dimension 6 in CPFEM_general, hence, variable "ngens" useless by now
2010-02-18 10:15:08 +00:00
Philip Eisenlohr c3cd75c2c2 small polishing 2010-02-18 10:12:45 +00:00
Franz Roters 9c63005c8f allow for longer pathes when openening files
corrected error messages concerning file openening
2010-02-18 08:29:57 +00:00
Christoph Kords 97db70cf23 constitutive_nonlocal:
- reworked contribution of immobile dislocation density for rate equations
- flux is now calculated on the basis of interpolated velocities and densities at the interface; both incoming and outgoing fluxes are considered, so every material point only changes his own dotState
- dislocation velocity is now globally defined and calculated by subroutine constitutive_nonlocal_kinetics; the subroutine is called inside _LpAndItsTangent as well as _microstructure; therefore, microstructure now needs Tstar_v as additional input; in the future one should perhaps create a subroutine constitutive_kinetics that calls constitutive_nonlocal_kinetics separately, to clearly distinguish between microstructural and kinetic variables 
- better use flux density vector as output variable instead of scalar flux values for each interface
- added output variables internal and external resolved stress

crystallite:
- added flag to force local stiffness calculation in case of nonlocal model
- misorientation angle is explicitly set to zero when no neighbor can be found

debug:
- added flag "selectiveDebugger" that is used when debugging statements should only affect a specific element, ip and grain; these are specified with the new variables debug_e, debug_i and debug_g
- debugger can now be used in its original sense
2010-02-17 13:21:36 +00:00
Christoph Kords a2037db9c6 corrected sign of screw part of dislocation stress 2010-02-12 12:54:00 +00:00
Claudio Zambaldi f1daf9f2e7 added comment, my first 'test' SVN commit 2010-02-10 16:40:50 +00:00
Philip Eisenlohr f186c83068 introduced racing condition breaker for the case of multithreaded CPFEM init. 2010-02-02 15:00:08 +00:00
Franz Roters 101d4c6bb4 updated list 2010-02-02 13:05:17 +00:00
Franz Roters 02b98100d1 added / updated files for use with marc2010r1 2010-01-11 08:35:28 +00:00
Christoph Kords ed8446e0f3 - corrected contribution of immobile singles to dipole formation and annihilation rates
- remobilization of immobile singles immediately increases the mobile single dislocation density and therefore directly affects all other mechanisms in dotState
2010-01-06 09:54:00 +00:00
Christoph Kords dce840c0a5 - introduction of immobile (used) single dislocation densities as new state variables
- changed nomenclature (rho -> rhoSgl) to distinguish precisely between single dislocation density and total dislocation density
- changed material.config accordingly
2010-01-05 16:07:24 +00:00
Christoph Kords 2098c106ad misorientation is set to 400 degrees if our neighbor has a different phase 2010-01-05 16:03:45 +00:00
Christoph Kords aee0721ab2 corrected math_misorientation 2010-01-05 16:02:00 +00:00
Christoph Kords ac080e0b52 corrected small mistake in calculation for ip center of gravity / ip coordinates; used to ignore subnodes that had coordinates (0.0, 0.0, 0.0) 2009-12-22 13:23:20 +00:00
Denny Tjahjanto 043356e8a9 homogenization_RGC.f90 >> just switching-off one of the debugging statement.
crystallite.f90 >> optimizing the perturbation algorithm for local tangent.
2009-12-22 12:28:02 +00:00
Christoph Kords 1f7aebfa4d new subroutine crystallite_orientations: calculates the orientation matrix and the euler angles and - in case of single grain ips - the misorientation for each neighboring ip.
The calculation of the misorientation is now done once in crystallite init and at the end of every FE increment. This saves a lot of time compared to doing it in dotState for every crystallite subinc.
2009-12-18 15:46:33 +00:00
Denny Tjahjanto 3ab5cdc770 Additional feature to the RGC scheme: The volumetric consistency constraint. This is implemented by penalizing any volumetric discrepancy which occurs due to severe relaxation. The penalty for volume inconsistency is described using a power-law model. The setting for this function can be done in the numerics.config via three new parameters, i.e., maxvoldiscrepancy_RGC, voldiscrepancymod_RGC and discrepancypower_RGC. For monintoring, an extra output variable in prescribed in the material.config in the RGC section, namely "(output) volumediscrepancy".
IO.f90 and numerics.f90 has been modified accordingly to accommodate these changes
2009-12-16 16:20:53 +00:00
Franz Roters 39d1932e2b corrected line parsing now counts all parts 2009-12-15 16:03:53 +00:00
Christoph Kords 01b7e88e5f adapted the material.config file to last changes in constitutive_nonlocal 2009-12-15 10:22:17 +00:00
Christoph Kords 26e9056f90 added stiffness state loop counter to nonlocal stiffness calculation 2009-12-15 09:03:04 +00:00
Christoph Kords d784153e0c constitutive_nonlocal:
- corrected flux term
- multiplication is now aware of dislocation type
- corrected change rate for "dipole size" dupper
- corrected term for dipole dissociation by stress change
- added transmissivity term in fluxes which accounts for misorientation between two neighboring grains (yet hardcoded transmissivity according to misorientation angle)
- added more output variables

constitutive:
-  2 additional variables "previousDotState" and "previousDotState2", which are used to store the previous and second previous dotState (used in crystallite for acceleration/stabilization of state integration)
- timer for dotState now measures the time for calls to constitutive_ collectState (used to reside in crystallite_updateState, which is not critical in terms of calculation time anymore) 

crystallite:
- convergence check for nonlocal elments is now done at end of crystallite loop, not at the beginning; we simple set all elements to not converged if there is at least one nonlocal element that did not converge
- need call to microstructure before first call to collect dotState for dependent states
- stiffness calculation (jacobian): if there are nonlocal elements, we also have to consider changes in our neighborhood's states; so for every perturbed component in a single ip, we have to loop over all elements; since this is extremely time-consuming, we just perturb one component per cycle, starting with the one that changes the most during regular time step.
- updateState gets a damping prefactor for our dotState that helps to improve convergence; prefactor is calculated according to change of dotState

IO:
- additional warning message for unknown crystal symmetry
2009-12-15 08:20:31 +00:00
Christoph Kords 07303d9506 - corrected math_misorientation subroutine 2009-12-15 07:34:53 +00:00
Christoph Kords 596b7f3727 - rearranged array with symmetry operations
- new subroutine "math_misorientation" which calculates misorientations (based on old subroutine "misorientation", which was not used previously)
- rendered some functions pure
2009-12-14 11:02:10 +00:00
Denny Tjahjanto cad278c3bc Introduce a randomness in the odd stress, using pre-factor rnd. 2009-12-09 10:33:00 +00:00
Franz Roters 9b1b612f67 added some examples 2009-12-08 15:31:50 +00:00
Denny Tjahjanto 1bf3b978eb modifying the criteria for the sum of microstructure fraction.
previously was:
if (the_sum /= 1.0_pReal) then (error 170)
this condition is too strict. it may give problem with some numerical truncation error.

now becomes:
if (abs(the_sum - 1.0_pReal) >= 1.0e-10_pReal) then (error 170)
2009-12-02 13:08:14 +00:00
Denny Tjahjanto 59d22d47b2 introduction of a possibility to have homogeneous element (all ips in one element are identical, sort of reduced integration)
and bugs-fixing in crystallite.f90, homogenization_RGC.f90, numerics.f90.
2009-11-24 15:00:25 +00:00
Denny Tjahjanto 6702cb3baa Introduction of a numerical viscosity into the RGC scheme to improve the convergent behavior and the numerical stability of the scheme (see: homogenization_RGC.f90). These changes have been incorporated in all related subroutines (homogenization.f90, IO.f90, numerics.config and numerics.f90). 2009-11-17 13:42:38 +00:00
Denny Tjahjanto cb88019aa6 introduced a flexibility in cut-backing scheme in homogenization.f90 and in crystallite.f90:
(1) subStepSizeHomog and subStepSizeCryst := size of substep when cut-back is applied (initially was hard-coded).
(2) stepIncreaseHomog and stepIncreaseCryst := step increase when calculation for substep converge (was also hardcoded).

introduced a possibility to choose different finite difference scheme, i.e., forward-, backward- and central-difference, for computing grain numerical tangent. note that central-difference scheme will slow down the computation significantly. please use it only if necessary.

parameters to set these new features have been included in numerics.f90 and numerics.config, whereas corresponding error messages have been introduced in the IO.f90
2009-11-10 13:36:27 +00:00
Luc Hantcherli 67f87486b1 in constitutive_dislotwin.f90:
in constitutive_nonlocal.f90:

Derivatives of shear rates w.r.t. resolved shear stress HAVE to be positive.
Computation of dgdot_dtauslip is now correct.
2009-11-06 17:46:12 +00:00
Philip Eisenlohr f96f9332cf added some comments and made sure that texture distribution among a large number of IPs is statistically sound. 2009-11-02 08:03:14 +00:00
Denny Tjahjanto 8f40c516bb added to the previous one 2009-10-30 10:00:17 +00:00
Denny Tjahjanto 2068346f6d just small changes in the 'default' value of RGC numerical parameters. 2009-10-30 09:54:52 +00:00
Christoph Kords 1e5a0318f3 don't do any cutbacks in homogenization when my materialpoint consists of only one grain. 2009-10-27 08:31:45 +00:00
Christoph Kords c766ba2e3a minimum substepping size in homogenization and crystallite is now controlled by two independent parameters subStepMinHomog and subStepMinCryst respectively.
deleted flush statements where they are not needed, since they seriously slow down computation.
2009-10-26 16:43:43 +00:00
Denny Tjahjanto f50d3291f9 sorry, back to the previous version. grain deformation output is part of crystallite.f90, no longer done by homogenization. material.config reflects the changes. 2009-10-22 16:59:24 +00:00
Denny Tjahjanto d344aaf3a0 added possibility to output individual grain deformation gradient in homogenization_RGC.f90 and the homogenization.f90 has been modified accordingly. see material.config for the key-words to output the individual grain deformation gradient in the homogenization block. 2009-10-22 09:24:05 +00:00
Philip Eisenlohr 1dcb80753c tidying up code and reversing order in debug timing output 2009-10-22 09:14:17 +00:00
Philip Eisenlohr 67f4bdfaa0 volume fraction where new twins may form is now limited to (1-F) instead of 1...
"relevantResistance" is set to 1 Pa as default
2009-10-22 08:58:14 +00:00
Philip Eisenlohr 5d01e30f77 deleted debugging statements that print out interaction/hardening matrixes 2009-10-21 13:41:49 +00:00
Philip Eisenlohr 5d5e7eb8f8 corrected uncritical mix-up of Ntwin and Nslip in reshaping fcc interaction (slip--twin) 2009-10-21 13:41:09 +00:00
Philip Eisenlohr 4e98935287 changed lattice_interaction matrices to (other:me) notation
fixed small mistake in hexagonal twin--slip interaction matrix

adopted above switched notation for hardening matrix calculation
shortened dotState by introducing dot_product notation
2009-10-21 13:10:12 +00:00
Christoph Kords 9892fd9a10 sorry: initialization of periodicBC was erroneous 2009-10-20 16:38:05 +00:00
Philip Eisenlohr e1586d5059 fixed (probably severe) bug in hexagonal twin system transformation into ortho-hexagonal coordinates.
cleaning up of twin system nomenclature

introduced lookup mechanism  to calculate the twinning shears depending on the c/a ratio of the present structure (was [wrongly!!] hardcoded to Titanium)
2009-10-20 16:13:25 +00:00
Christoph Kords c1ee34d235 constitutive_nonlocal:
- read in activation energy for dislocation glide from material.config
- changed naming of dDipMin/Max to dLower/dUpper
- added new outputs: rho_dot, rho_dot_dip, rho_dot_gen, rho_dot_sgl2dip, rho_dot_dip2sgl, rho_dot_ann_ath, rho_dot_ann_the, rho_dot_flux, d_upper_edge, d_upper_screw, d_upper_dot_edge, d_upper_dot_screw
- poisson's ratio is now calculated from elastic constants
- microstrucutre has state as first argument, since this is our output variable
- periodic boundary conditions are taken into account for fluxes and internal stresses. for the moment, flag has to be set in constitutive_nonlocal. 
- corrected calculation for dipole formation by glide
- added terms for dipole formation/annihilation by stress decrease/increase 

constitutive:
- passing of arguments is adapted for constitutive_nonlocal model

crystallite:
- in stiffness calculation: call to collect_dotState used wrong arguments
- crystallite_postResults uses own Tstar_v and temperature, no need for passing them from materialpoint_postResults

homogenization:
- crystallite_postResults uses own Tstar_v and temperature, no need for passing them from materialpoint_postResults

IO:
- changed error message 229

material.config:
- changed example for nonlocal constitution according to constitutive_nonlocal

all:
- added some flush statements
2009-10-20 14:36:03 +00:00
Philip Eisenlohr 48e642bb15 twin resistance evolution did not use magnitude of shear rate (dot gamma) but the signed quantity... leads to non-physical oscillations of twin resistance. 2009-10-20 12:15:37 +00:00
Philip Eisenlohr 7914f80931 stiffness calculation for structure > 3 was missing: "case(3)" --> now "case(3:)" as in all other constitutive_xyz..! 2009-10-19 14:47:52 +00:00
Philip Eisenlohr a94e551c5f absolute tolerance was just fine -- residuum is in Lp not in stress. Hence, unit is strain and not Pa... 2009-10-19 12:53:56 +00:00
Philip Eisenlohr ba27947142 material point now cuts back by 1/8
crystallite does not accelerate anymore, since, typically, longer step immediately fails and uses resources in vain. (future: remember number of successful steps to increase step size after x of those...)
2009-10-19 12:50:59 +00:00
Philip Eisenlohr b5fc0a9769 small rearrangement of cutback dealings. may give minute speed improvement... 2009-10-19 12:46:02 +00:00
Philip Eisenlohr 5a5d461a30 changed abs tolerance in stress loop to 1 Pa (from 1e-8 Pa ..?) 2009-10-19 12:44:20 +00:00
Philip Eisenlohr 992077e88e fixed cut back issue with Marc. Necessity to introduce compMode 7 to capture tangent restoration at lovl=4 call. 2009-10-17 09:25:36 +00:00
Philip Eisenlohr 974116808b fixed a potential memory leak for hexagonal structures. added some status output to constitutive_xx 2009-10-15 20:02:52 +00:00
Philip Eisenlohr 7f84961c93 less debug clutter... 2009-10-14 13:23:52 +00:00
Philip Eisenlohr c3cb72d356 put some comments to hybridIA 2009-10-14 13:21:03 +00:00
Luc Hantcherli 00450b2c16 Added constraint on the dipole distance
if dipole distance > dislocation mean free distance then
   dipole distance = dislocation mean free distance
2009-10-13 18:14:44 +00:00
Luc Hantcherli 3bf3d7ddbd New version of constitutive_dislotwin after first-round checks 2009-10-13 15:05:21 +00:00
Franz Roters 2c1a610b14 removed Koen's loading subroutine from abaqus interface 2009-10-13 06:55:15 +00:00
Philip Eisenlohr 0a34da292e # no need for materialpoint_results in hypela2
# homogenization updated to be compatible with abaqus interface
2009-10-12 17:01:42 +00:00
Luc Hantcherli ca1c61bf98 Changed constitutive_dislobased into constitutive_dislotwin 2009-10-12 16:44:17 +00:00
Philip Eisenlohr 8b66b8def2 # small remark to set "-free" switch for compile
# rename to Abaqus-compatible ".f" extension
2009-10-12 16:32:57 +00:00
Philip Eisenlohr 7d05845d5d # now $ID aware
# LF as line separation and some tidy up
2009-10-12 16:26:16 +00:00
Philip Eisenlohr 2c06cad4d0 now $ID aware 2009-10-12 16:25:48 +00:00
Philip Eisenlohr 21cad32137 # new interface for Abaqus
# IO has some additional functionality for Abaqus parsing
# ping pong scheme in FE interface now similar (and more human understandable) in both versions
# mesh has better splitting of different tasks, plus operation on database whenever possible
# FEsolver as new global var to indicate FEM solver type
# computation mode reshuffling: 6 is now Marc special case of recycling...
2009-10-12 16:01:49 +00:00
Philip Eisenlohr 02602144d2 can now be executed from different directories...but will operate on "its" one 2009-10-12 14:18:54 +00:00
Luc Hantcherli 3f41b271fb The new dislocation model is now implemented in constitutive_dislotwin.f90
(seems to run fine, but still under investigation)
2009-10-09 20:28:23 +00:00
Christoph Kords 4ff497e5ba mesh_build_sharedElems does not need an input argument anymore 2009-10-08 09:23:15 +00:00
Philip Eisenlohr e7247551f0 changed "build_sharedElements" to use (then existing) internal element data structure instead of reading again from the input file. The data structure is already established by "build_elements"... 2009-10-08 09:01:59 +00:00
Luc Hantcherli bb8a71557b Added comment on FCC different interaction types
1 --> self
2 --> coplanar
3 --> collinear
4 --> Hirth locks
5 --> glissile junctions
6 --> Lomer locks
2009-10-07 17:00:35 +00:00
Christoph Kords 9b3a59646a constitutive_nonlocal
- take orientation gradients into account when calculating dislocation stress and dislocation fluxes
- hard coded value for nu
- changed kinetics (parameter G0 is currently defined as a parameter, needs to be read from material.config)
- added some output statements

constitutive: 
- some functions and subroutines needed additional input variables for passing to constitutive_nonlocal 

crystallite:
- some functions and subroutines needed additional input variables for passing to constitutive
- call microstructure with current temperature, Fp, Fe, not "sub0" values
- show number of IPs, that are "onTrack" instead of those not "onTrack"
- calculate Fe at beginning of substep, since we need it for state preguess
2009-10-07 15:31:52 +00:00
Luc Hantcherli cc6aa1aeba Updated constitutive_dislotwin
Deleted constitutive_dislobased
2009-10-06 15:19:19 +00:00
Luc Hantcherli bc5a408c1a Changed constitutive_dislobased into constitutive_dislotwin:
in constitutive.90
in constitutive_dislotwin.f90
in mpie_cpfem_marc.f90
2009-10-06 15:16:03 +00:00
Franz Roters c5865bb7ec corrected calculation of dTdLp 2009-10-02 06:40:12 +00:00
Christoph Kords c67412c36b added missing constitutive outputs for nonlocal law 2009-10-01 16:31:06 +00:00
Christoph Kords b09b2b17f3 convergence of state in crystallite is now tested as follows:
(state < relevant state) or (residuum < relative tolerance * state)
since the relevant value for the state variables depend on their nature and can vary by large scales (e.g. volume fraction: 1e-10, dislocation density: 1e5) it is not possible to set a unique value. instead the constitutive law has to decide what is relevant. therefore, all constitutive laws now read in parameters from the material.config that determine the values for relevantState [@luc: in dislobased law relevant State is for the moment generally set to 1e-200, so no additional parameters necessary in material.config. if you also want this feature, we can still implement it, no big deal]

- added sanity checks in constitutive_nonlocal.f90

- corrected coordinate transformation for backstress calculation in constitutive_nonlocal.f90

- corrected equations for evolution of dipole dislocation densities (athermal annihilation and formation by glide)
2009-09-18 15:37:14 +00:00
Denny Tjahjanto ec524a1dd2 homogenization_RGC.f90
>> Fixing problems related to the size of homogenization_RGC_state vector.
2009-09-07 15:28:32 +00:00
Denny Tjahjanto 5f7e5b8409 homogenization_RGC.f90
<< correction for a very stupid mistake. replacing stress P with the absolute value of stress abs(P) during convergence check. it should work upon deep-drawing.
2009-09-03 20:26:20 +00:00
Franz Roters a16dbe4d32 material_config: added w0_slip in [Aluminum_phenopowerlaw] 2009-08-31 15:38:09 +00:00
Franz Roters 6d3c620e46 forgot to "use" the new init-routines 2009-08-31 15:21:15 +00:00
Franz Roters 2029b23f98 added version information to all files
do NOT edit text like this:
$Id: constitutive_phenopowerlaw.f90 406 2009-08-31 14:13:10Z MPIE\f.roters $
2009-08-31 15:09:15 +00:00
Franz Roters bb0840ecb2 constitutive_phenopowerlaw.f90: check for non-zero w0_slip
IO.f90: added respecteive error message

constitutive_phenopowerlaw.f90: first test with automatic file Id
2009-08-31 14:13:10 +00:00
Franz Roters 4357e29e07 yet another missing "then" in homogenization 2009-08-28 15:26:18 +00:00
Franz Roters c0d1140234 added a missing "then" 2009-08-28 15:14:27 +00:00
Denny Tjahjanto 3ea17dd2fd CPFEM.f90 >>> A very small, not important thing.
homogenization.f90 and crystallite.f90 >>> Correction in the algorithm to count the iteration distribution (for better statistics).

material.config and numerics.config >>> more collection of parameters.
2009-08-28 15:05:14 +00:00
Christoph Kords f27d66a9ae constitutive_nonlocal:
- dipole dislocations with evolution

crystallite.f90:
- collect state uses subdt and subTstar0_v
- in nonlocal modus: set all crystallites to broken if one is not on track anymore after either stress integration or state update
- constitutive_microstructure is now called inside state update and not in integrate_stress anymore

material.config:
- new parameter for nonlocal constitution

CPFEM.f90:
- age Tstar after increment was finished
2009-08-28 13:50:47 +00:00
Denny Tjahjanto 644265381e mpie_cpfem_marc.f90 >>> changing the compilation sequence of modules: numerics.f90 and IO.f90 move up, while math.f90 down.
IO.f90 >>> adding "inRad" instead of using inRad from math.f90 module, since math.f90 module is now below IO.f90.

numerics.f90 >>> now can read the parameter "fixed_seed" from numerics.config. this parameter is used to set a pseudo-random number generator/fixed seeding. default value is 0 (zero), which will give fully random number.

math.f90 >> adding a possibility to fix the seeding (i.e., pseudo random number)

numerics.config >>> add a new parameter: "fixed_seed"
2009-08-27 15:30:40 +00:00
Denny Tjahjanto b25396374a homogenization_RGC.f90 >>> adding some lines, mostly for debugging purpose. no critical change.
constitutive_phenopowerlaw.f90 >>> adding new parameter: constitutive_phenopowerlaw_w0_slip, i.e., the hardening rate exponent.
homogenization.f90 >>> most important change is to add an if-else statement (line 379-380) to switch crystallite_requeted = .false. for already converged material point iteration (el/ip). the rest of the changes are cosmetics and debugging stuffs.
crystallite.f90 >>> similar to homogenization.f90, the most important change is to add additional if-else statement (line 574) in the jacobian (perturbation) loop. now the jacobian calculation will only be performed when crystallite_requested = .true.. the rest is only cosmetic.
2009-08-27 12:10:06 +00:00
Denny Tjahjanto f70013ee9b lattice.f90: correction of typo from the last update (Philip) 2009-08-26 09:02:22 +00:00
Philip Eisenlohr 7720680f3a makeMe: some polishment
lattice: found memory leak (lattice_interactionTwinSlip had wrong size) and added further commenting
2009-08-26 07:28:43 +00:00
Christoph Kords 1dbd0865db constitutive_nonlocal.f90
- completed postResults output function
- connecting vector of neighboring material points is mapped to intermediate configuration of my neighbor

crystallite.f90
- zero out dotState only when crystallite is non-finished
- set nonfinished flag to false if crystallite is not on Track after state update
- in updateState: set onTrack flag to false if encounter NaN
- removed some old debugging outputs and added others

homogenization.f90
- in debugging mode now telling when a cutback happens
2009-08-24 08:16:01 +00:00
Franz Roters 387195e036 that was tooo quick, now it works hopefully 2009-08-13 13:32:17 +00:00
Franz Roters f400cdac5b corrected paramter check for phenopowerlaw 2009-08-13 13:27:14 +00:00
Denny Tjahjanto cafc39b183 replaces Nast with Nreps in hybridIA
formerly, if the number of orientations requested was (far) less than the number of nonzero bins in the texture representation, you only got a subset of low phi1 values..! (that is the top corner in Euler space -- Hi Bing ;-) )
2009-08-13 13:21:22 +00:00
Franz Roters 0ef4ec27b3 there was a lonesome endif that needed a comment 2009-08-13 12:56:07 +00:00
Luc Hantcherli 93543c21e9 In crystallite_stressAndItsTangent:
state is now correctly collected during perturbation method
2009-08-13 10:04:14 +00:00
Denny Tjahjanto 86211bf0ce homogenization_RGC.f90: adding comments to improve clarity 2009-08-12 14:13:20 +00:00
Christoph Kords 2aae7b7574 added dislocation multiplication to dotState in constitutive_nonlocal.f90
cleaned up debugging output statements to *.out file
2009-08-12 11:22:02 +00:00
Franz Roters 6171361c7e terminallyIll was missing in the use statement 2009-08-12 08:10:28 +00:00
Christoph Kords 8ed3ddc03b now with first draft of nonlocal constitutive law
debugging memory leak closed
debugging counters corrected

center of gravity stored in mesh

state updated is now split into a collecting loop and an execution

updateState and updateTemperature fill sequentially separate logicals and evaluate afterwards to converged

added 3x3 transposition function, norm for 3x1 matrix and 33x3 matrix multiplication in math

non-converged crystallite triggers materialpoint cutback (used to respond elastically)

non-converged materialpoint raises terminal illness which in turn renders whole FE increment useless by means of odd stress/stiffness and thus waits for FE cutback
2009-08-11 16:31:57 +00:00
Denny Tjahjanto 4689966c79 correction in homogenization_RGC.f90: in the use of material module
homogenization_typeInstance was included two times in previous version.
2009-08-06 12:47:14 +00:00
Christoph Kords 1a7eb3158b wrapped lines in order to ensure maximum number of allowed characters per line = 132 2009-08-03 06:37:37 +00:00
Denny Tjahjanto 360fb069ba List of changes/modifications:
* IO.f90 :: Adding error messages for RGC homogenization
* crystallite.f90 :: Modifying convergent criteria in crystalline_updateState and crystalline_updateTemperature
* material.f90 :: Adding IO_lc in homogenization_type(Name)
* debug.f90 :: Adding debbugging statement and counter for material point loop
* homogenization.f90 :: Adding homogenization_RGC blocks
* homogenization_isostrain.f90 :: Modifying argument of homogenization_isostrain_stateInit
* mpie_cpfem_marc.f90 :: Adding homogenization_RGC include
* numerics.f90 :: Adding numerical parameters for RGC scheme
* math.f90 :: Changing function name: math_permut to math_civita
2009-07-31 12:02:20 +00:00
Luc Hantcherli f0729a2e52 Cosmetic changes in constitutive_dislobased.f90
- more precise output labels
- do changes into forall
2009-07-28 10:08:13 +00:00
Franz Roters 1cd0b74b08 divide by 3.0 instead of 3 as it is _pReal 2009-07-27 09:23:39 +00:00
Philip Eisenlohr 53cff7458c polishing of constitutive output size determination in _init() 2009-07-24 15:23:45 +00:00
Luc Hantcherli 9bbde133a1 Updated constitutive_dislobased.90 and lattice.f90 according to the changes done in the previous release
- introduction of system families
- analogous structure to constitutive_phenopowerlaw.f90
- interaction types 0-1 changed into 1-2
2009-07-24 12:02:20 +00:00
Philip Eisenlohr 97d8a321e0 some cosmetics... 2009-07-23 13:33:53 +00:00
Philip Eisenlohr f337847f35 quite some changes:
# non-greedy memory allocation
# generation of outputConstitutive to allow for script-based T16 extraction
# exchange of phenomenological by more general phenopowerlaw
# lattice is based on slip and twin families which can be treated as individual entities (switched on/off, separate hardening, etc.)
# nicer debugging output
# changed some error/warning codes
# plus potentially some minor additional brushes here and there
2009-07-22 16:07:19 +00:00
Luc Hantcherli 290410b3fc Example of material.config, delivering the required information for the new version of constitutive_dislobased 2009-07-14 11:31:06 +00:00
Luc Hantcherli ce515beb39 THIS IS A MAJOR UPDATE
The different blocks required for the twinning model are now implemented (I guess correctly...)
Keywords in the material.config are changed. Since the flow rule for twin systems remains under investigation, this part is susceptible to further changes.
2009-07-14 11:26:52 +00:00
Luc Hantcherli d3343ef795 Corrected definition of vector n and d per deformation system; n is the system plane normal and d the corresponding direction 2009-07-14 11:20:35 +00:00
Christoph Kords fe2f3e4d36 - added sanity check for temperature tolerance
- added temperature tolerance in numerics.config
2009-07-02 16:37:48 +00:00
Luc Hantcherli 1c35103524 Corrected CPFEM: assignment of constitutive_state and _state0 consistent with homogenization_Ngrains (what is actually needed), instead of homogenization_maxMgrains 2009-07-02 08:57:35 +00:00
Luc Hantcherli 4aed2ade80 Major Update: all modules are now correctly submitted 2009-07-01 10:55:31 +00:00
Luc Hantcherli a16b8a619d Major update: corrected treatment of temperature 2009-07-01 10:29:35 +00:00
Christoph Kords 2e783df5ed corrected typo in the prime number function 2009-06-29 15:29:07 +00:00
Franz Roters a6ccfe2e44 restructured the repository: renamed trunk into code, moved documentation one directory up, therefore you can now checkout either code or documentation only if you like 2009-06-25 07:17:59 +00:00